-Do you know Sally? -Yes. I often saw her _______ in the gym. A. swim B. swam C. swimming
We won’t start the meeting _________ our teacher arrives
I think the new comer is easy to__ .
--What do you do with your homework?--I’m sorry, I _________ it at home.
--- I don’t know how to get there.--- I have no idea, ________.
Once upon a time, there _______ an emperor.